Visibility II / V
I went in the early evening, when the Moon was still low enough, to check at the previous day's surface halo workshop to see if the yesterday's snow could still form a surface halo for the Moon. After all, they episode them (Figure 1). He was also involved in the floodlight, so he got a joint portrait of the surface halo in moonlight and artificial light (picture 2).
The second image nicely demonstrates how the surface halo of a distant light source is light source-centric, but in the case of a near (divergent) light source, the backbone is very eccentric with respect to the light source. (Behind the 22r info button you will find a good explanation of the geometry of the artificial light surface halo).
Another demonstration of the artificial halo of halo can be found in this external video link: a 15-page video of a deforming surface halo. (During the video, the photographer bent his knees a couple of times. And tried to do it without tweaking the camera too much :)